Games come from a tradition of winning and losing, but their key strength over board, card or playground games is showing you your moment to moment progress. A video game can always make you feel like you’re getting better. The easiest way to do that is have you complete multiple tasks, or in the now-common gaming parlance, “beat them”.
You beat a game, you rarely finish it, and you never end it. You beat it.
You assert dominance over it by completing every task it asks you to accomplish. The simplest task for someone to understand is defeating someone else with similar tools. Think about football. The core actions you do in a game of football are easy to understand because they’re just basic actions. Throwing, catching, kicking. You’ve known how to do those things since you were a baby. Video games on the other hand require you to press certain buttons and move sticks around to manipulate a 2D or 3D plane. It’s hard enough wrapping your brain around the actions necessary to make your on-screen avatar do anything at all, let alone trying to explain some asinine set of rules you’ve layered over those actions. Imagine if football never existed as a sport, and only as a video game. A newcomer would have to not only figure out how to control the game and manipulate it as a player, but also figure out its many, many rules on top of that. It’s hard, and would make people stop playing pretty quickly- the last thing any developer wants.
So, our games give us tools, explain how to use them, and then ask us to beat someone up. That person is hurting you, use your tools to hurt them more. Use your tools in conjunction, develop strategies, but make sure you kill them before they kill you. It’s easy to understand, caters to our natural instincts, and best of all, it’s fun.